Delete row sig_b1bd9b665592 from signals

id sig_b1bd9b665592
event_id evt_043f5b05cc52
watcher_id NULL
signal_type news_headline_delta
value {"aggregator_url":"https://news.google ...
threshold NULL
direction NULL
severity NULL
window NULL
source news_rss
reason_trace {"_evidence_event_ids":["evt_29a62739a ...
dedupe_key signal_enriched:news_delta:fa375409fd9921e7
throttle_s 0
created_at 2026-04-13T03:40:42.018539+00:00
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